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ID:14351638
大小:1.09 MB
页数:7页
时间:2018-07-28
《研究生论坛围压作用下盐岩损伤恢复研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、(研究生论坛)围压作用下盐岩损伤恢复研究向高1,刘建锋1*,邹航2,徐扬梦迪1,邓朝福1,吴池1(1.四川大学水力学与山区河流开发保护国家重点实验室,四川成都610065;2.四川省水利水电勘测设计研究院,四川成都610065)摘要:为了解在围压作用下盐岩损伤恢复特性和盐岩损伤与强度之间的联系,设计了盐岩在不同围压、不同稳压时间之后盐岩强度测试试验。试验结果表明:加载初期,盐岩弹性模量随着稳压时间的增大而逐渐增大,且随着稳压时间的增大,盐岩峰值应力对应的轴向应变和横向应变均会逐渐增大;盐岩损伤与强度之间存在负相关联系;随着
2、稳围压时间的增加,盐岩强度逐渐增大,最后保持在趋于相对稳定的状态;在围压作用下盐岩损伤愈合可以分为损伤快速恢复阶段和损伤缓慢恢复阶段,且对于不同稳压大小,盐岩损伤恢复两个阶段有明显的时间节点,其中在损伤快速恢复阶段盐岩强度增幅比较明显,而在损伤缓慢恢复阶段,盐岩强度增幅较小;在一定范围内,盐岩损伤快速恢复阶段的时间长短随着稳压阶段围压的增大而逐渐减小,当σ3=5MPa时,所需时间T=12t;σ3=30MPa,所需时间T=4t;σ3=50MPa,所需时间T=2t;增加稳围压阶段的围压大小可以一点程度上缩短盐岩损伤快速恢复阶段
3、时间,但是增大围压可能会对盐岩造成新的损伤。关键词:盐岩;稳围压时间;稳围压大小;损伤恢复StudyofdamagerecoveryofsaltrockunderconfiningpressuresXIANGGao,LIUJianfeng,Zouhang,XUYANGMengdi,WUCi(StatekeylaboratoryofHydraulicandMountainRiverEngineer,CollegeofWaterResourceandHydropower,SichuanUniversity,Chengdu610
4、065,China)Abstract:Inordertounderstandsaltrockdamagerecoverycharacteristicsandtheconnectionofdamageandstrengthundertheeffectofconfiningpressure.Differenttesthasbeendesignedforsaltrockwithdifferentconfiningpressureanddifferentholdingtimeofconfiningpressure.Theresul
5、tsshowedthatatearlyloading,thesaltrockelasticmodulusincreasesgraduallyalongwiththeincreaseofthepressureholdingtime,andwiththeincreaseofpressureholdingtime,thecorrespondingaxialstrainandlateralstrainofsaltrockpeakstresswillincreasegradually.Thereisanegativecorrelat
6、ionbetweensaltrock damageandstrength.Withtheincreasingofholdingtimeofconfiningpressuretheintensityofsaltrockgraduallyincreasing,andfinallytendstomaintainarelativelystablestate.Thedamagerecoveryofsaltrockcanbedividedintorapiddamagerecoveryphaseandslowdamagerecovery
7、phaseundertheeffectofconfiningpressure,andthereisadistincttimenodefordifferentsaltrockdamagerecoveryphase.Intherapidrecoverystage,thestrengthofsaltrockincreasedobviously,butintheslowrecoverystage,theintensityofsaltrockincreasedlittle.Withinacertainrange,withtheinc
8、reasingofthestrengthofconfiningpressureinthestageofholdingconfiningpressure,thedurationofsaltrockrapiddamagerecoveryphaseisgraduallyreduced.Whenσ3are5、3
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